I spent 6 days in WDW a few weeks back and was able to try out the new MagicBand system while staying at the Animal Kingdom Lodge resort. About a month and a half prior to our departure we were able to customize our MagicBands with different colors, in addition we could have our names put on the inside of the band. After customizing we received the package with the bands in 2 days!
We were then prompted on the WDW site to pick our 3 FastPass+ selections per day. As I was planning for 5 people it was extremely easy to include everyone on each of the selections and make all of our FastPass+ selections with ease. This is a big plus as trying to get our other party (which was traveling separately) to duplicate my efforts would have been brutal.
The bands themselves are not the most comfortable things in the world. When they come they are formed more tall then wide. When you put them on you notice odd pinching on the sides of your wrist, instead of the top and bottom. It was a strange feeling that took some getting used to. I think putting a book on the top or something to flatten them out ahead of time would have been a smart move.
When we checked in we picked our PIN number. We were also on the disney dinning plan and were told we can use the bands for everything. Unlocking the hotel door took an odd bit of wrist acrobatics as the door jam is not the idea place to be placing your wrist, but the sensors worked fine.
In the parks the bands worked great. Main entry was a breeze, fastpass+ was great, and making purchases and dinning plan credits was incredibly easy. In addition changing FastPass+ reservations using the mobile app was incredibly easy. A few times a ride had a short line and while waiting I changed the experience to something different in the next hour, great for planning personality types. It feels great to never have to reach into your pocket to get out your wallet or a Fastpass.
Overall I really enjoyed using the MagicBands. The convenience of never having to reach into your pockets is quite freeing. The only trouble points were the comfort of the bands and the tweaking of the arm to unlock your hotel door. I'm probably missing quite a bit so if you have any questions on the use of them just ask!